BCM3037
®
BCM3037 QAMLINK® UNIVERSAL BURST MODULATOR
Interactive Set-Top Box Block Diagram with Dual Upstream Burst Modulators
• The Broadcom BCM3037 is a universal QPSK/QAM burst
transmitter for DOCSIS/EuroDOCSIS applications
DOCSIS/EuroDOCSIS, IEEE 802.14, DAVIC and DVB-
compliant
Programmable Modulation: π/4 DQPSK, QPSK, 16-QAM
Variable symbol rates up to 6.25 MB
25 Mbps maximum data rate
QAMLink modulator with α = 0.25/0.50 square-root Nyquist
filters
Digitally tunable IF center frequency up to 65 MHz
Programmable Components Include:
6 burst profiles
Analog output attenuation up to 25dB
Transmitter pre-equalizer
RS encoder, GF (256), T = 0 to 10
Last RS codeword: fixed length, shortened
23-bit randomizer: polynomial, seed, type
Differential/non-differential encoding
Integrated 10-bit digital-to-analog converter
Direct interface to BCM3250 MAC
JTAG Test Interface
64-pin PQFP Package
A high-performance, integrated solution for upstream
modulation in cable data modems, interactive cable-TV set-top
boxes, and wireless applications
Significantly increases upstream channel bandwidth
Supports multiple standards for worldwide deployment
Reduces system manufacturing costs and complexities with an
on-chip D/A converter
Improves robustness in noisy upstream channels utilizing pre-
equalization
Fully compatible with the Broadcom BCM3137 QAMLink
headend burst demodulator
FEATURES SUMMARY OF BENEFITS
PCI
Upstream 2
DOCSIS
Video
Out-of-Band
Upstream 1
Video
Video/Audio
Out
BCM3037
Upstream
QPSK/16-QAM
Modulator
BCM3250
Advanced
Single-Chip
Set-Top Box
Front E nd
BCM7030
High Definition
Video/Graphics
Subsystem
CPU